Leading-off plate for spiral separators.



F. PARDEE.

LEADING-OFF PLATE FOR SPIRAL SEPARATDRS.

APPLICATION FILED APR. 2n m4.

1 1 97,05? Patented Sept. 5, 1916.

g g 34 M A TTURNEY FRANK PARDEE, OF HAZLETON, PENNSYLVANIA.

LEADING-OFF PLATE FOR SPIRAL SEPARATOBS.

Specification of Letters Patent.

Patented Sept. 5, T916.

Application filed April 2, 1914. Serial No. 828,968.

To all whom it may concern:

Be it known that I, FRANK PARDEE, a citizen of the United States, and a resident of the city of Hazleton, county of Luzerne and State of Pennsylvania, have invented certain new and useful Improvements in Leading-Off Plates for Spiral Separators, of which the following is a specification, ref-- erence being had to the accompanying drawlngs.

The invention relates to leading 0E plates used to aid the lower plates of a spiral separator in delivering the slate, bone and coal to their proper leading-0E chutes.

The object of the invention is to construct an adjustable leading off plate which may be set in a position to give the final impetus and direction to difierent materials.

The accompanying drawings illustrate one embodiment of the invention.

In the drawings Figure 1, is a plan view of some of the lower plates of a spiral separator, showing the leading 01f plate and leading-off chutes, the central post being in cross-section. Fig. 2, is a perspective view of two separating plates one of which is adjacent to the leading off plate which is shown as being adjusted or set inward toward the post, above the plate which leads to the slate chute. Fig. 3, is a cross-section on line 3, 3, of Fig. 2, and Fig. 4, a similar section in which the adjustment of the lead ing off plate is outward, or more toward the bone and coal chutes.

In these drawings a, represents the central post around which the separating plates 6, b, are placed and secured so as to form a spiral separator having one or more spiral threads composed of plates extending for a suitable distance along and around the post a. In practice a spiral separator usually has what is termed a slate thread and a coal thread of larger diameter. The slate moves slower than the bone and gravitates toward the central post, and the bone runs outside of the slate on the slate thread, while the separated or clean coal passes over the edge of the slate thread and drops into a separate and larger coal thread. The word bone in its application here means any material containing coal, but not pure coal, as for example laminated pieces of slate and coal. Pieces of clean coal are occasionally impeded by the slate or bone, and the bone also is sometimes impeded by the slate, so that in the final deliveries there is liable to be a small percentage of mixed substances, and where the percentage is too great a re-separation 1s sometimes made.

The leading off plate is illustrated in the preferred form of a ridge plate 0, which is located adjacent to a lower separating plate 6, and pivotally secured as at 6 for admit-- ting of an inwardand outward adjustment. The ridge plate a, is of angle or gable formation and has a slight pitch along the length of the gable or ridge 0, but its sides have a steeper inward and outward pitch, and the lower end has flanges c 0 The inward incline of the ridge plate leads to a plate 03, from which the slate passes to a leading-off chute d. the ridge plate has a movement over a plate 6, from which the bone passes to a bone chute e. The coal chute leads from the coal thread near the central post a, at a point somewhat below the slate chute cl. The scope of adjustment which may be given to the ridge plate is illustrated by the positions in which it is shown in Figs.

3, and 4.

The material, as slate and bone, which comes down the separating plate 5 is, roughly speaking, arranged in two zones, the outer consisting of bone and the inner of slate. The upper end of the ridge 0 is at such a point that practically all the material from this point to the outer edge of the plate 6 will be bone. The material traveling in the zone inward from this point will strike the inner face of the ridge plate and part of it, by its tangential direction and its momentum, will travel upward and over the ridge 0 and down on the outer side thereof. If it does not succeed in mounting over the ridge 0 before striking the lower end flange c it will drop back onto the plate 03. With the parts adjusted as in Fig. 3 the maximum quantity of this material will ride over the ridge. With the adjustment of Fig. 4 the minimum quantity will do so. If the operator finds too much slate going into the bin intended for bone he will adjust the ridge plate in the direction toward Fig. 4, thus permitting the The outer incline of passage over the ridge plate of a smaller quantity of the material which strikes the inside of such rigid plate, the material passed being that which is nearest to the zone of practically the unmixed bone. When the conditionsare reversed the adjustment will be made in the direction toward the position of Fig. 3. In this adjustment, by reason of the location of the pivot '1) through one of the sides of the ridge plate, and by reason of the downward slope of the ridge plate from the end where it joins the separating plate to its free end, the outward adjustment of the free end is accompanied by a lifting movement thereof and the inward movement is accompanied by a lowering thereof. This vertical movement of the outer end adds to or subtracts from the difficulty which the material has in passing over the rldge. The combination of outward and upward movements makes it possible to secure a very substantial differentiation of the material flowing over the ridge with a comparatively slight adjustment. Any intermediate adjustment may be made within the limits of the movements permitted. The direction and impetus given to the different materials when they pass from the separating plateto one side or the other of the .leading off edge or ridge 0, will determine their final course toward the several leading-off chutes. In practice this plate has proven its capacity for nice adjustment and its efliciency in operation.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent is z 1. A spiral separator having spirally inclined separator plates in combination with a leading off plate having a face extending I from the lower edge of a separator plate downward in substantially a continuation of the spiral of said plate and having a separating edge extending from an intermediate point in the width of said separator plate downward in an approximately tangential direction.

2. A spiral separator having spirally inclined separator plates in combination with a leading off plate having a face extending from the lower edge of a separator plate downward in substantially a continuation A a of the spiral of said plate and having a sepdownward in substantially a continuation ofthe spiral of said plate and having a separating edge extending from an intermediate point in the width of said separator plate downward in an approximately tangential direction, said leading off plate being adjustable .to move its separating edge upward and outward or downward and inward, said leading off plate having an upward flange at its lower end to stop the forward movement of material which fails to pass over said edge.

4. A spiral separator having spirally inclined separator plates in combination with a leading ofi plate having a face extending from the lower edge of a separator plate downward in substantially a continuation of the spiral of said plate and having a separating edge extending from an intermediate -point in the width of said separator plate downward in an approximately tangential direction, said leading off plate being adjustable to move its separating edge upward and outward or downward and inward andhaving an upward flange at its lower end to stop the forward movement of material which fails to pass over said edge. v

5. A spiral separator having spirally inclined separator plates in combination with a leading off plate having two faces at an angle to each other and meeting along a separating edge, the inner face extending from the lower edge of a separator plate downward in substantially a continuation of the spiral of said plate, the separating edge extending from an intermediate point in the width of said separator plate downward in an approximately tangential direction and the outer face extending from said separating edge downward and outward.

6. A spiral separator having spirally inclined separator plates in combination with a leading oflf plate having two faces at an angle to each other and meeting along a separating edge, the inner face extending from the lower edge ofa separator plate down ward in substantially a continuation of the spiral of said plate, the separating edge extending from an intermediate point in the width of said separator plate downward in an approximately tangential direction and the outer face extending from said separating edge downward and outward, said leading off plate being adjustable about a pivotal axis passing through the inner face thereof.

7. A spiral separator having spirally inclined separator plates in combination with a leading ofi plate having two faces at an angle to each other and meeting along a separating edge, the inner face extending from the lower edge of a separator plate downward in substantially a continuation of the spiral of said plate, the separating edge extending from an intermediate point in the memos? m width of said separator plate downward in lower end to stop the movement of material an approximately tangential direction and over said end. the outer face extending from said separating edge downward and outward, said FRANK PARDEE' leading off plate being adjustable about a Witnesses:

pivotal axis passing through the inner face FRANCIS H. BLATGH,

thereof, and having an upward flange at its S. A. BARBER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner oi Patents,

, Washington, D. C. 

